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United States Patent | 6,188,373 |
Martek | February 13, 2001 |
Systems and methods are disclosed for providing elevation scanning for a multiple beam antenna system on a per antenna beam basis. In a preferred embodiment columns of antenna elements are divided into sub-groups each having a beam forming matrix associated therewith. Phase differentials are introduced into the antenna beam signals of each sub-group of antenna elements in order to provide a phase progression which steers the antenna beam a predetermined angle from the broadside. The phase differentials are independently provided for each antenna beam signal to thereby allow independent steering of each antenna beam. Additionally, dielectric material placed in the signal feed path may be utilized to alter radiation characteristics of certain antenna elements of the antenna system. Placing the dielectric material with outer elements of an array may be used for aperture tapering and side lobe control. Additionally, wind loading, due to the antenna system is reduced by using a gridded ground plane system.
Inventors: | Martek; Gary Allen (Edgewood, WA) |
Assignee: | Metawave Communications Corporation (Redmond, WA) |
Appl. No.: | 034471 |
Filed: | March 4, 1998 |
Current U.S. Class: | 343/893; 342/375; 343/853; 343/890 |
Intern'l Class: | H01Q 021/00 |
Field of Search: | 343/853,893,846,848,890,891 342/371,372,373,374,375 |
4827270 | May., 1989 | Udugawa et al. | 343/853. |
5264862 | Nov., 1993 | Kumpfbeck | 343/853. |
5561434 | Oct., 1996 | Yamayaki | 343/700. |
5589843 | Dec., 1996 | Meredith et al. | 343/820. |
5872547 | Feb., 1999 | Martek | 343/815. |
5936591 | Aug., 1999 | Yamasa et al. | 343/853. |
5940048 | Aug., 1999 | Martek | 343/893. |
5969689 | Oct., 1999 | Martek et al. | 343/758. |
6094166 | Feb., 1999 | Martek et al. | 342/374. |